X-Original-To: pgsql-sql-postgresql.org@localhost.postgresql.org Received: from localhost (unknown [200.46.204.144]) by svr1.postgresql.org (Postfix) with ESMTP id E15C852806 for ; Tue, 17 May 2005 14:01:09 -0300 (ADT) Received: from svr1.postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 31176-09 for ; Tue, 17 May 2005 17:01:06 +0000 (GMT) Received: from koolancexeon.g2switchworks.com (mail.g2switchworks.com [63.87.162.25]) by svr1.postgresql.org (Postfix) with ESMTP id E66D552807 for ; Tue, 17 May 2005 14:01:04 -0300 (ADT) Received: mail.g2switchworks.com 10.10.1.8 from 10.10.1.37 10.10.1.37 via HTTP with MS-WebStorage 6.5.6944 Received: from state.g2switchworks.com by mail.g2switchworks.com; 17 May 2005 12:01:03 -0500 Subject: Re: Does Postgresql have a similar pseudo-column "ROWNUM" as From: Scott Marlowe To: Dennis.Jiang@thomson.com Cc: pgsql-sql@postgresql.org In-Reply-To: References: Content-Type: text/plain Content-Transfer-Encoding: 7bit Message-Id: <1116349263.22291.129.camel@state.g2switchworks.com> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 (1.4.6-2) Date: Tue, 17 May 2005 12:01:03 -0500 X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, hits=0.006 tagged_above=0 required=5 tests=AWL X-Spam-Level: X-Archive-Number: 200505/127 X-Sequence-Number: 21440 On Thu, 2005-05-12 at 14:07, Dennis.Jiang@thomson.com wrote: > Hi: > > Oracle has a pseudo-column "ROWNUM" to return the sequence number in which a row was returned when selected from a table. The first row ROWNUM is 1, the second is 2, and so on. > > Does Postgresql have a similar pseudo-column "ROWNUM" as Oracle? If so, we can write the following query: > > select * > from (select RowNum, pg_catalog.pg_proc.* > from pg_catalog.pg_proc) inline_view > where RowNum between 100 and 200; You can get a functional equivalent with a temporary sequence: create temp sequence rownum; select *, nextval('rownum') as rownum from sometable;